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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 12
Ann. Geophys., 27, 4391–4407, 2009
https://doi.org/10.5194/angeo-27-4391-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 4391–4407, 2009
https://doi.org/10.5194/angeo-27-4391-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Dec 2009

02 Dec 2009

The response of the magnetosphere-ionosphere system to a sudden dynamic pressure enhancement under southward IMF conditions

Y Yu and A. J. Ridley Y Yu and A. J. Ridley
  • Department of Atmospheric, Oceanic and Space Science, University of Michigan, Ann Arbor, MI, USA

Abstract. The magnetospheric response to step-like solar wind dynamic pressure increases under southward IMF conditions is studied using the University of Michigan MHD code. A two phased response in the ionosphere is observed, similar to what is observed when the IMF is northward by looking into the residual potential and field-aligned current (FAC) patterns in the ionosphere. The first phase response right after the high pressure enhancement hits the magnetopause is associated with a pair of FACs downward in the postnoon and upward in the prenoon region. These FACs are caused by dusk-to-dawn electric fields inside the dayside magnetopause launched by a fast mode compressional wave. The second phase response shows another pair of potential cells as well as FACs in opposite polarity, which originates from magnetospheric vortices on the equatorial plane. The vortices appear to be formed by the recovery of the system from the fast mode wave.

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